These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
In advance of his inauguration, Putin resigned as United Russia chairman, handing control of the party to Medvedev. He was inaugurated as president on May 7, 2012, and one of his first acts upon assuming office was to nominate Medvedev to serve as prime minister.